*Notes: This is priceless. I am an avid chess player and although I know this is fantasy, I can see how it could exist. Thank you so much for writing. I have included a line-by-line review below.
Red - changes needed
***You maybe (two words) interested to know that the game of chess is not unique to humans. For eons (comma) it has been popular throughout other galaxies and in some dimensions (comma) chess has involved past a mere strategic board game.
***This of course gets tricky if any of the “Goes-back” moves were the result of a previous “Goes-back” variation. Often this results in violent frays, eventually broken up by the L.A.R.P.S (lethal Armed Riot-Patrol Squad). (caps on Lethal)
***The wisest species throughout the galaxies and dimensions warn against challenging any Stfxthqian to a game of chess, (no comma) unless you are prepared to engage in mortal combat.
***The Stfxthqians have included what they refer to as the “Sajaybee Advanced Goes Back Variation" (SAG 2BV for short) in which the opponent can insist on a “Goes Back” on his/her first move.
***Legend has it that an extremely intelligent Chess-Grandmaster from another galaxy once crash-landed on Stfxthq and was challenged to a game by one of the mechanics whilst his spacecraft was being repaired. After several moves (comma) he fell into a deep trance and when he came too, he had formulated a cunning strategy which resulted in him checkmating his opponent.
***Needless to say (comma) word of this match spread like wild fire (one word) and Stfxthqs demanded to learn of this strategy but the Grandmaster (comma) his opponent and the rest of the mechanics mysteriously vanished without a trace (as did the spaceship according to the story).
***They alleged the Mechanics and the Opponent were paid of off (or silenced permanently) while the passing Grandmaster had been incarcerated in a secret underground laboratory for experiments.
***Fanatical cults watched the skies in hope that one-day (not hyphenated) the mechanics would return to show them the “sacred strategy of Goes Back”.
***The remainder who couldn’t careless (two words) about chess, simply got on with their lives.

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Ultimate Trinket Adventure [Mainland]  (E) Collect treasures, complete tasks, and win the golden Apple.. #2267246 by In the manGer(vic), He sleeps